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Table 3 Predictors of fertility by background characteristics in Nigeria

From: Ethnic disparities in fertility and its determinants in Nigeria

Background Variables Hausa/F Igbo Yoruba All All All
    Model 1 Model 2 Model 3
aIRR(C.I) aIRR(C.I) aIRR(C.I) aIRR(C.I) aIRR(C.I) aIRR(C.I)
Age
 15–24 0.212*** (0.196, 0.229) 0.311*** (0.262, 0.370) 0.333*** (0.279, 0.399)   0.222*** (0.208, 0.236) 0.234*** (0.219, 0.250)
 25–34 0.515*** (0.480, 0.552) 0.560*** (0.495, 0.633) 0.610*** (0.539, 0.691)   0.518*** (0.492, 0.546) 0.536*** (0.508, 0.566)
 35–44 0.846*** (0.786, 0.910) 0.825** (0.732, 0.929) 0.905 (0.799, 1.024)   0.838*** (0.794, 0.885) 0.846*** (0.801, 0.894)
 45–49 1 1 1   1 1
Ethnicity
 Hausa/F     1.725*** (1.661, 1.792) 1.398*** (1.334, 1.466) 1.148* (1.021, 1.292)
 Igbo     1.043 (0.997, 1.091) 1.135*** (1.07, 1.199) 1.031 (0.925, 1.148)
 Yoruba     1 1 1
Residence
 Urban 1.002 (0.932, 1.077) 0.996 (0.911, 1.089) 0.934 (0.833, 1.047)    0.998 (0.952, 1.046)
Education
 No education 1.246* (1.007, 1.541) 1.399** (1.144, 1.710) 1.348** (1.109, 1.638)    1.333*** (1.213, 1.465)
 Primary 1.262* (1.015, 1.569) 1.369*** (1.185, 1.583) 1.396*** (1.220, 1.598)    1.364*** (1.250, 1.487)
 Secondary 1.160 (0.931, 1.444) 1.110 (0.981, 1.255) 1.252*** (1.113, 1.409)    1.208*** (1.117, 1.307)
Higher 1 1 1    1
Religion
 Christian 0.853 (0.447, 1.630) 0.991 (0.729, 1.348) 1.014 (0.612, 1.680)    0.944 (0.746, 1.195)
 Islam 0.961 (0.552, 1.671) 0.824 (0.425, 1.597) 1.032 (0.623, 1.710)    0.990 (0.779, 1.259)
 Others 1 1 1    1
Wealth Index
 Poor 1.016 (0.927, 1.113) 1.055 (0.926, 1.202) 0.979 (0.785, 1.220)    1.041 (0.978, 1.109)
 Middle 0.983 (0.897, 1.078) 1.007 (0.903, 1.123) 1.082 (0.940, 1.245)    1.027 (0.966, 1.092)
 Rich 1 1 1    1
Sex preference
 No 1.032 (0.982, 1.085) 1.106 (1.018, 1.201)* 1.091 (0.999, 1.191)    1.057** (1.017, 1.098)
Age at first birth
 < 18 1.386*** (1.326, 1.450) 1.358*** (1.229, 1.501) 1.268*** (1.135, 1.416)   1.419*** (1.367, 1.473) 1.367*** (1.316, 1.420)
 18+ 1 1 1   1 1
Ever used any contraceptive
 No 0.896 (0.801, 1.003) 0.804*** (0.739, 0.874) 0.873** (0.804, 0.947)    0.855*** (0.812, 0.900)
Fertility Preference
 < 5 0.869* (0.780, 0.967) 0.749*** (0.678, 0.828) 0.772*** (0.707, 0.842)    0.807*** (0.765, 0.852)
 5+ 1 1 1    1
Marital Status
 Never married 1.150 (0.063, 16.095) 0.538*** (0.426, 0.679) 0.684* (0.490, 0.954)    0.660*** (0.547, 0.795)
 Married 1 1 1    1
LogLL −26,782.020 − 7943.533 − 7838.901 −54,442.465 −42,934.796 −42,598.395
AIC 53,610.039 15,933.066 15,723.802 108,890.929 85,885.591 85,246.791
Deviance (v/df) 0.105 0.092 0.074 1.074 0.108 0.098
  1. ***p < 0.001; **p < 0.01; *p < 0.05; aIRR adjusted incidence rate ratio, AIC Akaike Information Crriteria